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// Copyright 2021-2023 The Connect Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package connect_test
import (
"context"
"log"
"os"
connect "connectrpc.com/connect"
pingv1 "connectrpc.com/connect/internal/gen/connect/ping/v1"
"connectrpc.com/connect/internal/gen/connect/ping/v1/pingv1connect"
)
func ExampleUnaryInterceptorFunc() {
logger := log.New(os.Stdout, "" /* prefix */, 0 /* flags */)
loggingInterceptor := connect.UnaryInterceptorFunc(
func(next connect.UnaryFunc) connect.UnaryFunc {
return connect.UnaryFunc(func(ctx context.Context, request connect.AnyRequest) (connect.AnyResponse, error) {
logger.Println("calling:", request.Spec().Procedure)
logger.Println("request:", request.Any())
response, err := next(ctx, request)
if err != nil {
logger.Println("error:", err)
} else {
logger.Println("response:", response.Any())
}
return response, err
})
},
)
client := pingv1connect.NewPingServiceClient(
examplePingServer.Client(),
examplePingServer.URL(),
connect.WithInterceptors(loggingInterceptor),
)
if _, err := client.Ping(context.Background(), connect.NewRequest(&pingv1.PingRequest{Number: 42})); err != nil {
logger.Println("error:", err)
return
}
// Output:
// calling: /connect.ping.v1.PingService/Ping
// request: number:42
// response: number:42
}
func ExampleWithInterceptors() {
logger := log.New(os.Stdout, "" /* prefix */, 0 /* flags */)
outer := connect.UnaryInterceptorFunc(
func(next connect.UnaryFunc) connect.UnaryFunc {
return connect.UnaryFunc(func(ctx context.Context, req connect.AnyRequest) (connect.AnyResponse, error) {
logger.Println("outer interceptor: before call")
res, err := next(ctx, req)
logger.Println("outer interceptor: after call")
return res, err
})
},
)
inner := connect.UnaryInterceptorFunc(
func(next connect.UnaryFunc) connect.UnaryFunc {
return connect.UnaryFunc(func(ctx context.Context, req connect.AnyRequest) (connect.AnyResponse, error) {
logger.Println("inner interceptor: before call")
res, err := next(ctx, req)
logger.Println("inner interceptor: after call")
return res, err
})
},
)
client := pingv1connect.NewPingServiceClient(
examplePingServer.Client(),
examplePingServer.URL(),
connect.WithInterceptors(outer, inner),
)
if _, err := client.Ping(context.Background(), connect.NewRequest(&pingv1.PingRequest{})); err != nil {
logger.Println("error:", err)
return
}
// Output:
// outer interceptor: before call
// inner interceptor: before call
// inner interceptor: after call
// outer interceptor: after call
}
func ExampleWithConditionalHandlerOptions() {
connect.WithConditionalHandlerOptions(func(spec connect.Spec) []connect.HandlerOption {
var options []connect.HandlerOption
if spec.Procedure == pingv1connect.PingServicePingProcedure {
options = append(options, connect.WithReadMaxBytes(1024))
}
return options
})
// Output:
}
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